Here is a lesson I have created for a mixed/high ability year 7 group on solving equations. It assumes that they have learned both about inverse functions, and forming expressions from words. I found this approach to develop a deep understanding of what is happening when we solve equations and haven't seen it taught this way, let me know what you thought about it! Attached you will find the relevant printing file. Some questions have been adapted from other resources on TES, feel free to modify, improve, and share! Please rate, as I appreciate the feedback.